Effect of hydraulic retention time on microbial community in biochemical passive reactors during treatment of acid mine drainage

2018 ◽  
Vol 247 ◽  
pp. 624-632 ◽  
Author(s):  
Yaneth Vasquez ◽  
Maria C. Escobar ◽  
Johan S. Saenz ◽  
Maria F. Quiceno-Vallejo ◽  
Carmen M. Neculita ◽  
...  
Keyword(s):  
Microbial Community ◽  
Acid Mine Drainage ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Mine Drainage ◽  
Acid Mine

Long-term performance of a UASB reactor treating acid mine drainage: effects of sulfate loading rate, hydraulic retention time, and COD/SO42− ratio

2018 ◽  
Vol 30 (1) ◽  
pp. 47-58 ◽  
Author(s):  
Mirabelle Perossi Cunha ◽  
Rafael Marçal Ferraz ◽  
Giselle Patrícia Sancinetti ◽  
Renata Piacentini Rodriguez
Keyword(s):  
Acid Mine Drainage ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Loading Rate ◽  
Mine Drainage ◽  
Uasb Reactor ◽  
Acid Mine ◽  
Long Term Performance ◽  
Term Performance

Effects of Hydraulic Retention Time, COD/SO42− Ratio, Influent Iron Concentration, and Sulfate Kinetics on Treatment of a Synthetic Acid Mine Drainage

2020 ◽  
Vol 39 (4) ◽  
pp. 851-858
Author(s):  
Marina Isabel Vianna de Oliveira Ribeiro ◽  
Juliana Kawanishi Braga ◽  
Renata Piacentini Rodriguez ◽  
Giselle Patricia Sancinetti
Keyword(s):  
Acid Mine Drainage ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Mine Drainage ◽  
Iron Concentration ◽  
Acid Mine ◽  
Synthetic Acid

scholarly journals Hydraulic retention time and pH affect the performance and microbial communities of passive bioreactors for treatment of acid mine drainage

AMB Express ◽  
2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Tomo Aoyagi ◽  
Takaya Hamai ◽  
Tomoyuki Hori ◽  
Yuki Sato ◽  
Mikio Kobayashi ◽  
...  
Keyword(s):  
Acid Mine Drainage ◽  
Microbial Communities ◽  
Retention Time ◽  
Hydraulic Retention Time ◽  
Mine Drainage ◽  
Acid Mine

scholarly journals Hydraulic retention time affects bacterial community structure in an As-rich acid mine drainage (AMD) biotreatment process

2018 ◽  
Vol 102 (22) ◽  
pp. 9803-9813 ◽  
Author(s):  
Lidia Fernandez-Rojo ◽  
Corinne Casiot ◽  
Vincent Tardy ◽  
Elia Laroche ◽  
Pierre Le Pape ◽  
...  
Keyword(s):  
Community Structure ◽  
Acid Mine Drainage ◽  
Bacterial Community ◽  
Retention Time ◽  
Bacterial Community Structure ◽  
Hydraulic Retention Time ◽  
Mine Drainage ◽  
Acid Mine

Assessing arsenic bioremediation potential of epilithic biofilms affected by acid-mine drainage

2020 ◽  
Author(s):  
Sarah Zecchin ◽  
Nicoletta Guerrieri ◽  
Evelien Jongepier ◽  
Leonardo Scaglioni ◽  
Gigliola Borgonovo ◽  
...  
Keyword(s):  
Microbial Community ◽  
Acid Mine Drainage ◽  
Mine Drainage ◽  
Heterotrophic Bacteria ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Sampling Point ◽  
Epilithic Biofilm ◽  
Acid Mine ◽  
Epilithic Biofilms

<p>Arsenic is a toxic but naturally abundant metalloid that globally leads to contamination in groundwater and soil, exposing millions of people to cancer and other arsenic-related diseases. In several areas in Northern Italy arsenic in soil and water exceeds law limits (20 mg kg<sup>-1</sup> and 10 mg L<sup>-1</sup>, respectively), due to both the mineralogy of bedrock and former mining activities. The Rio Rosso stream, located in the Anzasca Valley (Piedmont) is heavily affected by an acid mine drainage originated from an abandoned gold mine. Arsenic, together with other heavy metals, is transferred by the stream to the surrounding area. The stream is characterized by the presence of an extensive reddish epilithic biofilm at the opening of the mine and on the whole contaminated waterbed.</p> <p>The aim of this study was to characterize the mechanisms allowing the biotic fraction of this biofilm to cope with extreme arsenic concentrations. The composition and functionality of the microbial communities constituting the epilithic biofilms sampled in the close proximity and downstream the mine were unraveled by 16S rRNA genes and shotgun Illumina sequencing in relation to the extreme physico-chemical parameters. In parallel, autotrophic and heterotrophic microbial populations were characterized <em>in vivo</em> by enrichment cultivation and isolated strains were tested for their ability to perform arsenic redox transformation.</p> <p>Preliminary analyses indicated that the biofilm accumulated arsenic in the order of 6 · 10<sup>3</sup> mg kg<sup>-1</sup>, in contrast to 0.14 mg L<sup>-1</sup>, measured in the surrounding water. The main chemical parameter affecting the composition of the microbial community was the pH, being 2 next to the mine and 6.7 in the downstream sampling point. In both sampling sites iron- and sulfur-cycling microorganisms were retrieved by both cultivation and molecular methods. However, the diversity of the microbial community living next to the mine was significantly lower with respect to the community developed downstream. In the latter, autotrophic <em>Cyanobacteria</em> belonging to the species <em>Tychonema</em> were the dominant taxa. A complete arsenic cycle was shown to occur, with heterotrophic bacteria mainly responsible for arsenate reduction and autotrophic bacteria performing arsenite  oxidation.</p> <p>These observations indicate that the epilithic biofilm living in the Rio Rosso stream represents a peculiar ecosystem where microorganisms cope with metalloid toxicity likely using diverse mechanisms. Such microbial metabolic properties might be exploited in bioremediation strategies applied in arsenic-contaminated environments.</p>

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